Wristwatch



FIG. 1 is a top plan view of a wristwatch showing my new design;

FIG. 2 is a right side elevational view thereof; and

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right, front and top perspective view thereof.

The bottom is substantially flat and unornamented. 

The ornamental design for a wristwatch, as shown and described. 